Lab 12: Titration of Acetic Acid in Vinegar
To lesarn how to titrate chemicals in a lab. Also to be able to determine the concentration of an acetic acid solution. Purpose:
To learn how to titrate, and calulate the concentration of an acetiuc acid solution. In this case the concentration of vinegar, which is diluted acetic acid. Hypothesis:
The sodium hydroxide used in this titration would balance out the acetic acid in vinegar. The phenolpthalein, a acid –base color indicator will let us know the vinegar have reach a point of neutralization once the vinegar turns pink. We can then calculate the concentration of acetic acid in the vinegar. Procedure:
Set up the lab:
Take a tick text book and place it on top of the labpaq box to use as a titrator holder. Slip the clamp into the textbook by placing the test tube clamp into the middle of the book. The stop cock tip should be 1-2 cm above the beaker. Use the test tube holder to clamp the 10 mL syringe with an affixed stop cock twisted on a the end. The syringe and the sto pcock will ac taas your titrator. Place a 100 mL beaker next to the box/book stack, placing it under your titrator. Place a piece of white paper under your beaker to help observe the change in color. Fill the syringe from the top with NaOH from the dropper bottle with 9-10 mL of the 0.5 M NaOH solution. Let a few drops drip into the beaker to be sure there is no air in the tip of the titrator. Pour in drain and flush with water, wash and dry beaker to be use in the experiment Experiment:
Read and record the intial volume of the NaOH solution in the titrator on your data table. Use a graduated cylinder to measure 5 mL of vinegar sample then pour it in to the 50 mL beaker. Add 2 drops of the phenolpthalein to the vinegar sample.
Place the vinegar sample with phenolpthalein under the titrator. Open the stop cock and add one drop at a time of the NaOH to the beaker. Swirl gently after each drop into the beaker...
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